# CMCalc vs RLM

The clearest difference is rating: RLM at 5.0 against CMCalc's 4.5. RLM also leads on update cadence (every 4 weeks vs every 45 months). CMCalc's advantage is in-app purchases (none vs 1) and ratings volume (6 vs 1). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. RLM sells 1 one-off in-app purchase. CMCalc asks for nothing beyond the download.

RLM holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: CMCalc has 6 ratings behind it against 1, so its average is the more settled of the two.

CMCalc ships an update every 45 months, RLM every 4 weeks. The most recent releases landed on September 7, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | CMCalc | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (6 ratings)](https://appshunter.io/ios/app/cmcalc/id974432836/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 45 months | **Every 4 weeks** |
| Monetization | Free | Free |
| Size | 4 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [William David](https://appshunter.io/developer/974432835) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### CMCalc

[App page](https://appshunter.io/ios/app/cmcalc/id974432836)

This app emulates a classic 1980s computer math calculator, offering decimal arithmetic, binary conversions, and logic functions. It supports parentheses for complex calculations and includes modern features like copy/paste and landscape mode.

**Highlights:** Decimal arithmetic, Binary conversions (decimal, binary, octal, hexadecimal), Binary logic functions, Operator grouping with parentheses, Hexadecimal input (A-F), Copy and paste results/functions, Landscape mode

**Features:** macOS Compatibility

**In-app purchases:** none


### RLM

[App page](https://appshunter.io/ios/app/rlm-10cx/id6466089794)

This scientific calculator offers a comprehensive suite of tools for finance, business, statistics, and complex scientific calculations. It emulates a classic calculator while leveraging modern iOS device capabilities for ease of use and advanced functions.

**Highlights:** Finance and Business calculations, Date and Time interval calculations, Advanced Statistics and Curve Fitting, Complex Numbers and 3D Vectors, Unit and Currency Conversions, Equation Solver, Programmable functions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $9.99 | one-time |


## Frequently asked questions

### Is CMCalc free?

CMCalc is free to download, with no in-app purchases.

### Is RLM free?

RLM is free to download, with in-app purchases available.

### Which has better reviews, CMCalc or RLM?

RLM is rated higher. CMCalc averages 4.5 out of 5 from 6 ratings, while RLM averages 5.0 from 1 ratings.

### Do CMCalc or RLM have ads?

Neither CMCalc nor RLM shows ads.

### Which is updated more often, CMCalc or RLM?

CMCalc ships an update every 45 months, and RLM every 4 weeks. Most recently, CMCalc was updated on September 7, 2026 and RLM on September 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*